Messages in this thread | | | Date | Fri, 21 Oct 2005 12:56:16 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH 0/4] Swap migration V3: Overview |
| |
mike kravetz wrote: >>>Just to be clear, there are at least two distinct requirements for hotplug. >>>One only wants to remove a quantity of memory (location unimportant). The >>>other wants to remove a specific section of memory (location specific). I >>>think the first is easier to address. >>> >> >>The only difficulty to remove a quantity of memory is how to find >>where is easy to be removed. If this is fixed, I think it is >>easier to address. > > > We have been using Mel's fragmentation patches. One of the data structures > created by these patches is a 'usemap' thats tracks how 'blocks' of memory > are used. I exposed the usemaps via sysfs along with other hotplug memory > section attributes. So, you can then have a user space program scan the > usemaps looking for sections that can be easily offlined. > yea, looks nice :) But such pages are already shown as hotpluggable, I think. ACPI/SRAT will define the range, in ia64.
The difficulty is how to find hard-to-migrate pages, as Andrew pointed out.
Thanks, -- Kame
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |